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|
(***********************************************************************)
(* *)
(* MLTk, Tcl/Tk interface of OCaml *)
(* *)
(* Francois Rouaix, Francois Pessaux, Jun Furuse and Pierre Weis *)
(* projet Cristal, INRIA Rocquencourt *)
(* Jacques Garrigue, Kyoto University RIMS *)
(* *)
(* Copyright 2002 Institut National de Recherche en Informatique et *)
(* en Automatique and Kyoto University. All rights reserved. *)
(* This file is distributed under the terms of the GNU Library *)
(* General Public License, with the special exception on linking *)
(* described in file LICENSE found in the OCaml source tree. *)
(* *)
(***********************************************************************)
(* $Id$ *)
open Support
open Protocol
external internal_tracevar : string -> cbid -> unit
= "camltk_trace_var"
external internal_untracevar : string -> cbid -> unit
= "camltk_untrace_var"
external set : string -> string -> unit = "camltk_setvar"
external get : string -> string = "camltk_getvar"
type textVariable = string
(* List of handles *)
let handles = Hashtbl.create 401
let add_handle var cbid =
try
let r = Hashtbl.find handles var in
r := cbid :: !r
with
Not_found ->
Hashtbl.add handles var (ref [cbid])
let exceptq x =
let rec ex acc = function
[] -> acc
| y::l when y == x -> ex acc l
| y::l -> ex (y::acc) l
in
ex []
let rem_handle var cbid =
try
let r = Hashtbl.find handles var in
match exceptq cbid !r with
[] -> Hashtbl.remove handles var
| remaining -> r := remaining
with
Not_found -> ()
(* Used when we "free" the variable (otherwise, old handlers would apply to
* new usage of the variable)
*)
let rem_all_handles var =
try
let r = Hashtbl.find handles var in
List.iter (internal_untracevar var) !r;
Hashtbl.remove handles var
with
Not_found -> ()
(* Variable trace *)
let handle vname ~callback:f =
let id = new_function_id() in
let wrapped _ =
clear_callback id;
rem_handle vname id;
f() in
Hashtbl.add callback_naming_table id wrapped;
add_handle vname id;
if !Protocol.debug then begin
prerr_cbid id; prerr_string " for variable "; prerr_endline vname
end;
internal_tracevar vname id
(* Avoid space leak (all variables are global in Tcl) *)
module StringSet =
Set.Make(struct type t = string let compare = compare end)
let freelist = ref (StringSet.empty)
let memo = Hashtbl.create 101
(* Added a variable v referenced by widget w *)
let add w v =
let w = Widget.forget_type w in
let r =
try Hashtbl.find memo w
with
Not_found ->
let r = ref StringSet.empty in
Hashtbl.add memo w r;
r in
r := StringSet.add v !r
(* to be used with care ! *)
let free v =
rem_all_handles v;
freelist := StringSet.add v !freelist
(* Free variables associated with a widget *)
let freew w =
try
let r = Hashtbl.find memo w in
StringSet.iter free !r;
Hashtbl.remove memo w
with
Not_found -> ()
let _ = add_destroy_hook freew
(* Allocate a new variable *)
let counter = ref 0
let getv () =
let v =
if StringSet.is_empty !freelist then begin
incr counter;
"camlv("^ string_of_int !counter ^")"
end
else
let v = StringSet.choose !freelist in
freelist := StringSet.remove v !freelist;
v in
set v "";
v
let create ?on: w () =
let v = getv() in
begin
match w with
Some w -> add w v
| None -> ()
end;
v
(* to be used with care ! *)
let free v =
freelist := StringSet.add v !freelist
let cCAMLtoTKtextVariable s = TkToken s
let name s = s
let coerce s = s
|
